This is how you would find available appointment slots in openemr.
Go to calendar, click on any time slot or click on the plus sign above the month calendar on the left column, once the appointment dialogue opens, scroll down and click on the “Find Available”.
Remember that for this to work, you need to select your desired office hours in the calendar:
https://www.open-emr.org/wiki/index.php/Using_the_Calendar
I regret I was not able to show you this during the call last Saturday, so here it is now.